Led driver brightness control

Precise PWM generation supports phase-cut dimming and power factor correction. It has a wide voltage operating range and low power consumption. Multiple safety features ensure full system protection under fault conditions.

At the same time, 6 kinds of color light can be combined to satisfy people's preference for color conversion. The LED drive circuit uses a switching power supply as the first level of control, and a pressure control constant current source as the second level of control. Combining the advantages of the two can ensure efficiency and control accuracy.

Moreover, it is directly provided by the city with electricity, two-layer drive, high safety, and it is not easy to damage the expensive LED lights.

What is an LED driver used for? LED drivers are devices which regulate and supply the power used to 'drive' runs of LED strip lighting. Similar to traditional transformers, they transform mains voltage alternating current v AC to a lower voltage. Do I need a driver for LED lights? Every LED light source requires a driver. Some LEDs already include an integrated driver within the bulb.

What is the difference between a transformer and an LED driver? A transformer is by convention a double wound device, just ac in, ac out. Drivers are more sophisticated than that and usually give a dc output using a switched-mode system, also they have current regulating and monitoring circuits in them. Can a LED driver be used as a power supply? Constant current and Constant voltage drivers are both viable options for a power supply for LED light sources, what differs is the way in which they deliver the power.

How many LEDs can a driver power? How many lights can one driver power? Drivers are not limited by the number of LED lights they power. They are restricted by the total wattage of the LED lights they power. How long does an LED driver last? Namely, the life of the driving circuit expires prior to when the LED stops emitting light or has its brightness dropped.

The typical nominal lifetime of these elements is often times less than 25, hours, while the lifetime of LED itself could be as long as 50,, hours. Do LED drivers get hot? Heat is the enemy of electronics and this goes for LED drivers too. This doesn't mean that LED drivers cannot operate in hot environments, they can.

The output capacity of a switch-mode power supply, including LED drivers reduces as the temperature increases. How do I choose an LED driver? The driver must have a higher output power than your LEDs require for extra safety. If the output is equivalent to the LED power requirements, it is running at full power. Running at full power may cause the driver to have a shorter life span. How do I know if my LED drivers are bad? LED drivers rectify higher voltage alternating current to low voltage.

Usually the circuits burn out and fail. How does an LED driver circuit work? The voltage drop across an LED is approximately constant over a wide range of operating current; therefore, a small increase in applied voltage greatly increases the current. It is quite clear that economic growth is closely linked to energy availability. Energy availability can be approached by two ways; the first way is to build more power plants to cover the increased demand. The second way is to reduce the power consumption.

LED lighting has many advantages like high reliability, low maintenance cost, dimming in addition to the main advantage of energy saving and strong expected performance enhancement. On the other hand, the disadvantages are mainly due to the initial cost of changing the lighting systems in addition to the need of a special power electronics circuitry to drive them for regulated intensity and brightness. The project goal is replace the halogen bulbs 50W to integrated led lamp 10W.

LEDs have many advantages when compared with other light sources such as incandescent or fluorescent lamps. The most significant advantages are fast turn-on, lower heat generation, lower power consumption and higher operating life.

LEDs need to be driven properly to ensure optimal performance and long life. The driver must be cost effective, which is not usually achieved with discrete components but can be realized with integrated solutions.

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Apogeeweb 12 Mar Adjust PWM duty cycles wrt to each other to get desired colour. Then multiply each PWM duty cycle by a common brightness scaling factor. The following is written at a rush.

Concept is believed sound but it may be v hard to underatand, Ask if not clear. These may be further reduced by PWM ing for brightness control. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Podcast Helping communities build their own LTE networks.

Podcast Making Agile work for data science. Featured on Meta. New post summary designs on greatest hits now, everywhere else eventually. Related 4. Hot Network Questions. This is needed because the drivers need a 2 volt overhead to power the internal circuitry. For example, using the Wired mA BuckPuck driver with a 24 volt input, you would have a maximum output voltage of 22 volts. This leads us to finding what input voltage we need for our LEDs. Input voltage, after all, equals our maximum output voltage for our driver after we take into account the driver circuit overhead voltage.

Make sure you know the minimum and maximum input voltages for your LED drivers. In finding what your input voltage should be for an application you can use this simple formula.

This determines the minimum input voltage you need to provide. Now this helps us make sure the voltage works, but in order to find the right power supply we also need to find the wattage of the whole LED circuit. The calculation for LED wattage is:. Overworking the power supply can cause the LEDs to flicker or cause premature failure of the power supply.

Just calculate the cushion by multiplying the total wattage by 1. So for our above example we would want at least The closest common power supply size will be 25 watts so it would be within your best interest to get a 25 Watt Power supply with a 24 Volt output. The FlexBlock LED drivers are boost drivers which means they can output a higher voltage than what is supplied to them.

This is extremely helpful in applications where your input voltage is limited and you need to get. As with the BuckPuck driver , the maximum number of LEDs you can power with a single driver in-series is determined by dividing the maximum output voltage of the driver by the forward voltage of your LEDs. The FlexBlock can be connected in two different configurations and varies when it comes to input voltage.

You find the maximum output voltage of the driver in this mode with this formula:. Now with AC input drivers they give off a certain amount of watts to run so you need to find the wattage of your LEDs.

You can do this by using this formula:. NOTE: It is important to consider the minimum output voltage of off-line drivers when designing your application. For instance, the driver above has a minimum output of 15 volts. So now you should have a pretty good idea on what an LED driver is and on what you need to look for in selecting a driver with a power supply that is sufficient enough for your application.